14-Bit, 210 MSPS

AD9744

Rev. B

Information furnished by Analog Devices is believed to be accurate and reliable.

However, no responsibility is assumed by Analog Devices for its use, nor for any

infringements of patents or other rights of third parties that may result from its use.

Specifications subject to change without notice. No license is granted by implication

or otherwise under any patent or patent rights of Analog Devices. Trademarks and

registered trademarks are the property of their respective owners.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781.329.4700

www.analog.com

Fax: 781.461.3113

©2005 Analog Devices, Inc. All rights reserved.

FEATURES

High performance member of pin-compatible

TxDAC product family

Excellent spurious-free dynamic range performance

SFDR to Nyquist

83 dBc @ 5 MHz output

80 dBc @ 10 MHz output

73 dBc @ 20 MHz output

SNR @ 5 MHz output, 125 MSPS: 77 dB

Twos complement or straight binary data format

Differential current outputs: 2 mA to 20 mA

Power dissipation: 135 mW @ 3.3 V

Power-down mode: 15 mW @ 3.3 V

On-chip 1.2 V reference

CMOS-compatible digital interface

28-lead SOIC, 28-lead TSSOP, and 32-lead LFCSP packages

Edge-triggered latches

APPLICATIONS

Wideband communication transmit channel

Direct IFs

Base stations

Wireless local loops

Digital radio links

Direct digital synthesis (DDS)

Instrumentation

FUNCTIONAL BLOCK DIAGRAM

1.2V REF

REFLO

3.3V

0.1

µF

CLOCK

SLEEP

REFIO

FS ADJ

DVDD

DCOM

CLOCK

DIGITAL DATA INPUTS (DB13–DB0)

150pF

3.3V

AVDD

ACOM

AD9744

CURRENT

SOURCE

ARRAY

IOUTA

IOUTB

MODE

LSB

SWITCHES

SEGMENTED

SWITCHES

LATCHES

Figure 1.

GENERAL DESCRIPTION

The AD97441 is a 14-bit resolution, wideband, third generation

member of the TxDAC series of high performance, low power

CMOS digital-to-analog converters (DACs). The TxDAC fam-

ily, consisting of pin-compatible 8-, 10-, 12-, and 14-bit DACs,

is specifically optimized for the transmit signal path of commu-

nication systems. All of the devices share the same interface

options, small outline package, and pinout, providing an up-

ward or downward component selection path based on per-

formance, resolution, and cost. The AD9744 offers exceptional

ac and dc performance while supporting update rates up to

210 MSPS.

The AD9744’s low power dissipation makes it well suited for

portable and low power applications. Its power dissipation can

be further reduced to a mere 60 mW with a slight degradation

in performance by lowering the full-scale current output. Also,

a power-down mode reduces the standby power dissipation to

approximately 15 mW. A segmented current source architecture

is combined with a proprietary switching technique to reduce

spurious components and enhance dynamic performance.

Edge-triggered input latches and a 1.2 V temperature compen-

sated band gap reference have been integrated to provide a

complete monolithic DAC solution. The digital inputs support

3 V CMOS logic families.

PRODUCT HIGHLIGHTS

1. The AD9744 is the 14-bit member of the pin compatible TxDAC

family, which offers excellent INL and DNL performance.

2. Data input supports twos complement or straight binary data

coding.

3. High speed, single-ended CMOS clock input supports

210 MSPS conversion rate.

4. Low power: Complete CMOS DAC function operates on

135 mW from a 2.7 V to 3.6 V single supply. The DAC full-

scale current can be reduced for lower power operation, and a

sleep mode is provided for low power idle periods.

5. On-chip voltage reference: The AD9744 includes a 1.2 V

temperature compensated band gap voltage reference.

6. Industry-standard 28-lead SOIC, 28-lead TSSOP, and 32-lead

LFCSP packages.